Washington is around the same size as Senegal.

Senegal is approximately 196,722 sq km, while Washington is approximately 172,348 sq km, making Washington 87.61% the size of Senegal. Meanwhile, the population of Senegal is ~17.9 million people (11.2 million fewer people live in Washington).
This to-scale comparison of Senegal vs. Washington uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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